198 Morphologie, Befruchtung, etc. — Ph3^siologie. 



Scott, D. G., On abnormal flowers of Solanum tuberosum (New 

 Phytologist. Vol. V. W\ 4. p. 77—81. Textfig. 11. 1906.) 



The most striking abnormality of the flowers in question was 

 the presence of large numbers of normal ovules on the filaments of 

 the stamens, although the ovaries produced ovules in the normal 

 manner. There was no instance of abortion and only one of increase 

 (a tricarpellary ovary). The petals were occasionally found with poUen 

 sacs and the stamens were sometimes partially petaloid. The staminal 

 ovules were quite like those produced in the ovary and were 

 either situated on the ventral faces of the stamens or on the walls 

 lining special cavities in the stamens. The author was unable to 

 determine whether these staminal ovules were pollinated. 



F. E. Fritsch. 



Shreve, Forrest, The development and anatomy oi Sarraceiiia 

 purpurea. (Botanical Gazette XLII. p. 107—126. pl. 3—5. Aug. 1906.) 



The seventy or eight}^ stamens arise in ten groups in which no 

 distinction of whorls is visible. The tapetum is derived whoUy from 

 the archesporium and its cells become binucleate. The tetrad division 

 is simultaneous, the nuclei showing twelve chromosomes; division 

 into tube and generative nuclei takes place before shedding of the 

 pollen. The ovule has a Single integument, isanatropous, and contains 

 a Single megaspore mothercell which usually gives rise to four 

 spores, the chalazal one of which is functional. The embryo-sac, 

 which is normal in its development, almost completely absorbs the 

 nucellar tissue, and hence comes to lie practically free inside the 

 integument. The pollen tubes grow through definite conducting 

 tissue and afterward through schizogenic canals. The endosperm 

 nucleus first produces a row of eight cells, then grows less regularl3\ 

 The cotyledons function first as haustoria and then as Chlorophyll 

 Organs. The first true leaf is pitchered, and its cavity arises by the 

 upward growth of an 0-shaped projection at the side of the finger- 

 shaped leaf primordium. M. A. Chrysler. 



Abderhalden E. und Y. Teruuehi, Vergleichende Untersu- 

 chungen über einige proteolytische Fermente pflanz- 

 licher Herkunft (Hoppe— Sej^lers Zeitschrift für physiol. Chemie. 

 Bd. IL. p. 21-25. 1906.) 



In einer früheren Arbeit haben Abderhalden und Rona auf die 

 grosse Bedeutung der von Emil Fischer dargestellten Peptide für 

 die Klassifizierung der proteolytischen Enzyme hingewiesen. 

 Während danach Pankreassaft viele Peptide rasch in ihre Kompo- 

 nenten zerlegt resp. angreift, hat Pepsinsalzsäure bis jetzt noch 

 keines derselben gespalten. Ein für die Spaltung ganz besonders 

 geeignetes Peptid ist das Glycyl-1-tyrosin. Es zeichnet sich durch 

 eine grosse Löslichkeit in Wasser aus. Seine Komponenten lassen 

 sich sehr leicht nachweisen, indem das Tyrosin selbst in Wasser 

 sehr schwer löslich ist, währeijd das Glj^kokoll durch die Schwer- 

 löslichkeit seines Esterchlorhydrates leicht festgestellt werden kann. 



Es ist bis jetzt nicht gelungen, die proteolytischen Enzyme 

 nach ihrer Wirkung in allen Einzeltällen zu gruppieren. Mit Sicher- 

 heit lassen sich nach den bisherigen Untersuchungen nur zwei 

 grosse Gruppen aufstellen: die Gruppe des Trj^psins und die Gruppe 



